This is a Free Service provided by Why Fund Inc. (a 501 C3 NonProfit) We thank you for your donation!

(1. Click on the course Study Set you wish to learn.) (2. If you wish you can click on "Print" and print the test page.) (3. When you want to take a on anyone of the tests for that Study Set.) (4. Click on "Check Answers" and it will score your test and correct your answers.) (5. You can take all the tests as many times as you choose until you get an "A"!) (6. Automated college courses created from lecture notes, class exams, text books, reading materials from many colleges and universities.)


Long-Term Learning

Learn efficiently and remember over time.

Start Long-Term Learning

Get personalized study reminders at intervals optimized for better retention.
Track your progress on this set by creating a folder
Or add to an existing folder

Add this set to a folder

  • Wave

    a disturbance passing through a medium or space


    substance that the wave is passing through

    Mechanical Waves

    require a medium to travel through (water and sound waves)

    Electromagnetic Waves

    do not require a medium (light and radio waves)

    Transverse Waves

    particles on the wave vibrate perpindicular to the direction that the wave is going

    Longitudinal Waves

    particals on these waves vibrate parallel to the direction that the wave is moving


    the distance from a point on one wave to the identical point on the next wave


    number of waves passing each second, measured in hertz


    maximum displacement of a wave from the rest position or the size of the wave or how large the wave is


    waves will bounce off barriers at an angle equal to the angle they will strike the barrier

    Law of Reflection

    "Angle of incidence= Angle of reflection"


    bending of a wave as it passes at an angle into another medium


    bending of waves around barriers


    dissipation of wave energy as the wave moves away from the source


    how easily or difficultly a wave can be launched in a medium


    the effect of 2 waves passing each other as described by the principle of Superposition

    Principle of Superposition

    when 2 waves pass each other, the resulting wave is the vector of the 2 waves. After they meet, they continue undisturbed

    Construction Interference

    waves add as they meet

    Destructive Interference

    the waves partly or completely cancel as they pass

    Rectilinear propagation

    wave swill travel in straight lines or paths in a uniform medium

    Explain behavior of waves at different boundaries

    when a wave strikes a rigid barrier, it reflects inverted. When it strikes a non-reigid barrier, it reflects upright

    Sonic Spectrum

    complete range of the longitudinal waves

    Audio Spectrum

    part of the sonic spectrum that humans can hear frequencies between 20Hz and 20,000Hz

    Infra Sonic

    range of frequencies below 20Hz

    Ultra Sonic

    range of frequencies above 20,000 Hz. Many animals can hear thes frequencies

    Echo Location

    animals like bats send out ultrasonic frequencies and "hear" the reflection to determine if an object is near


    subjective perception of intensity


    power of the sound wave passing through an area

    Relative Intensity

    compares the intensity to the softest sound or "threshhold of hearing"


    subjective perception of frequency

    Doppler Effect

    change in frequency heard when the source of sound and the person recieving the sound are in relative motion

    Fundamental frequency

    harmonics are the whole number multiples of this


    whole number multiples of the fundamental frequency

    Quality of Sound

    depends upon the number of harmonics produced and their intensities

    Law of Strings

    for the frequency produced by a vibrating string: the frequency is directly proportional to the tension and the frequency is inversely proportional to the string's density, diameter, and length

    Sympathetic Vibrations

    occurs when a standing sound wave is produced in a tube causing the tube to produce an amplified sound


    2 sound waves close in frequency prducing an oscillating sound wave


    wave undergoes no displacement


    wave undergoes maximum displacement

    Threshold of Pain

    120 dB over a long period of time

    Threshold of Hearing

    decibel scale, can also be called relative intensity

    How is sound produced and transmitted?

    sound is produced by vibration, a vibrating object will send out a wave, the faster the object vibrates, the higher the frequency

    Compare the velocity of sound in solids, liquids, gases and space.

    sound travels fastest in solids, slower in liquids, slowest in gases and it doesn't travel at all in space

    Explain how the ear detects sound.

    sound travels down the auditory canal and strikes the eardrum. The vibrating eardrum causes 3 tiny bones on the other side of the eardrum to vibrate, they send pulses through the cochlea which is lined with cilia. The movement of cilia is detected as sound.

    Standing wave

    interference pattern produced when 2 waves of the same frequency and wavelength pass each other

    Please allow access to your computer’s microphone to use Voice Recording.

    Having trouble? Click here for help.

    We can’t access your microphone!

    Click the icon above to update your browser permissions above and try again


    Reload the page to try again!


    Press Cmd-0 to reset your zoom

    Press Ctrl-0 to reset your zoom

    It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

    Please upgrade Flash or install Chrome
    to use Voice Recording.

    For more help, see our troubleshooting page.

    Your microphone is muted

    For help fixing this issue, see this FAQ.

    Star this term

    You can study starred terms together

    ! Voice Recording

    This is a Plus feature